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Posts Tagged: MAP Sensor

P0107 Manifold Absolute Pressure Circuit Low

Fix code P0107 trouble code The Manifold Absolute Pressure sensor/Barometric Pressure Sensor (MAP/BARO)is a “speed density” method of determining the air fuel ratio. The sensor measures intake manifold vacuum, which varies depending on how wide open the throttle is. However, while the pistons are pulling a vacuum on the down-stroke, outside barometric pressure is also pushing air into the cylinder. So the sensor actually takes two readings—one before the engine starts (barometer pressure) and one after the engine starts. Once the engine is running, the computer constantly monitors the changing … Read More

Test MAP Sensor on Chrysler vehicles

How to Test MAP Sensor on Chrysler vehicles Mid 90’s Chrysler vehicles used a Manifold Absolute Pressure Sensor (MAP sensor) to determine the vacuum and air density of incoming air. Here’s how to test it. When you first turn the key without starting the engine, the computer takes a reading on the MAP to get barometric pressure. Then, when you start the engine and vacuum is applied to the MAP, it can subtracts barometric from manifold vacuum to get a reading on density. As you open the throttle, manifold vacuum … Read More

MAP sensor — what it does

What does MAP sensor do A Manifold Absolute Pressure (MAP sensor) gives the engine’s computer data with which it can calculate the density of the incoming air. Calculating density is not as easy as it sounds. Sure, atmospheric pressure gives us some idea of the air’s weight. But remember, the engine is sucking in air, so it’s creating a vacuum. With atmospheric pressure pushing air into the engine and the pistons sucking air in, the computer really wants to know the difference between the two. That’s why the reading is … Read More

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